Recrystallization Post-Assignment

Suppose that you have a 1:1 mixture of compounds that is comprised of compound X and compound Y. You desire pure compound X and are planning a recrystallization to enhance the purity. Which solvent below is optimal for your recrystallization?      Ethanol (boiling point = 78 °C)   Solubility At   0  °C 100  °C Compound X 0.05 g/mL 0.20 g/mL Compound Y 0.02 g/mL 0.40 g/mL           Water (boiling point = 100 °C)   Solubility At   0  °C 100  °C Compound X 0.02 g/mL 0.05 g/mL Compound Y 0.01 g/mL 0.10 g/mL           Methanol (boiling point = 65 °C)   Solubility At   0  °C 65  °C Compound X 0.04 g/mL 0.10 g/mL Compound Y 0.02 g/mL 0.30 g/mL         Acetone (boiling point = 56 °C)   Solubility At   0  °C 56  °C Compound X 0.10 g/mL 0.50 g/mL Compound Y 0.20 g/mL 0.50 g/mL         Ethyl Acetate (boiling point = 77 °C)   Solubility At   0  °C 77  °C Compound X 0.10 g/mL 0.60 g/mL Compound Y 0.30 g/mL 0.60…

The alcohol content of hard liquor is normally given in terms of the “proof,” which is defined as twice the percentage by volume of ethanol (C2H5OH) present. Calculate the number of grams of alcohol present in 1.00 L of 75-proof gin. The density of ethanol is 0.798 g/mL. Round off to 4 sig. figures for all calculations made prior to final answer and the final answer should be in 3 sig. figures

Why is fractional distillation more efficient than simple distillation when purifying liquid mixtures?

A certain liquid X has a normal boiling point of 93.90 °℃ and a boiling point elevation constant K₁ = 1.14 °C-kg-mol¯¹. Calculate the boiling point of a solution made of 40.1g of zinc chloride (ZnCl₂) dissolved in 350. g of X. Round you answer to 4 significant digits. °C x10 X 1 Ś

A student wants to determine how different factors affect the rate of dissolving a solid in water. Trial Size of Particles Rate of Dissolving 1 small 10 sec medium 20 sec 3 large 30 sec What procedures can be performed on trials 2 and 3 so that the rate of dissolving is the same as trail 1? The student can decrease the temperature The student can decrease the pressure The student can increase the pressure The student can increase the temperature

5. Why does slow distillation result in better separation of two liquids than fast distillation?

NO₂ 4 5 NH₂ NH HNO3 Isopropanol, NaOH reflux, 12 h 6 NO₂

Submit Previous Answers A solid mixture consists of 25.5 g of KNO (potassium nitrate) and 4.5 g of K2SO4 (potassium sulfate). The mixture is added to 130. g of water v Correct Use this solubility curve (Eigure 1) to answer the questions. Crystallization Crystallization is the opposite of dissolution. Since solids tend to dissolve better at higher temperatures, we can cause them to crystallize (i.e., undissolve) from a solution by lowering the temperature. Part B If the solution described in the introduction is cooled to 0 °C, what mass of KNO, should crystallize? Enter your answer numerically in grams. • View Available Hint(s) Figure < 1 of 1 29.65 KNO, / NH,CI Previous Answers Submit 50- Nac X Incorrect; Try Again; 6 attempts remaining 40 30 LiSO, Part C Complete previous part(s) 20 - K,SO, 10- Part D KCIO, 10 20 30 40 50 60 For which salt, K2SO,, LişSO,. KCIO,, or NH,C1, will increasing the temperature of the water have the greatest change in solubility per 100 g solvent?…

2. The table below has IUPAC names and boiling points for four of the organic compounds discussed in the Kahn Academy video on simple and fractional distillation. Draw the structure of each compound, and label the polar and nonpolar groups with the type of attractive force the molecules can use to interact with one another. acetone (2-propanone); boiling point = 56 °C Polar dipoit-dipole dispersion, nonpolar cyclohexane; boiling point = 81 °C 가~ -nonpolar, dispersion ethanol; boiling point = 78 °C Polar, hydrogen (OH) bonding nonpolar acetic acid (ethanoic acid); boiling point = 118 °C E polar, dipole-dipole honpolar, OH 7-polar, hydrogen bonding dispersion Explain the relative boiling points of these compounds in terms of the attractive forces and masses of each molecule.

30 20 10 From the procedure 2. Assemble the simple distillation apparatus as generally shown in Figure SD.1 in the lab manual, ensuring that the thermometer bulb is aligned at, or slightly below, the Y in the distillation head. Each ground joint is greased by putting three or four stripes of grease lengthwise around the male joint and pressing the joint firmly into the other without twisting. 3. Attach a water condenser to the distillation head. 4. Remember, water goes in the bottom and out the top. Attach a clamp holder to the end of the drain tube to keep it weighted in the drain. Turn water to a trickle. If it is slowly draining, it is high enough. Begin a low flow of water through the condenser. 5. Place the set up on a heating/stir plate. 6. Turn on the hot plate to start heating the solution. Monitor the temperature and the boiling of the solution throughout the distillation process. 7. Record the temperature of the distillate when the first drops are recovered. 30.0 8. Adjust…

REPORT FOR EXPERIMENT 9 (continued) NAME F. Solubility vs. Temperature; Saturated and Unsaturated Solutions Data Table: Circle the choices which best describe your observations. NaCl 1.0 g +5 mL water 1.0 g +5 mL water +1.4 g dissolved completely? yes/no saturated or unsaturated? dissolved completely? yes/no saturated or unsaturated? 2.4 g +5 mL water +heat dissolved completely? yes/no saturated or unsaturated? 2.4 g +5 mL water after cooling dissolved completely? yes/no saturated or unsaturated? NHC dissolved completely? yes/no saturated or unsaturated? dissolved completely? yes/no saturated or unsaturated? dissolved completely? yes/no saturated or unsaturated? dissolved completely? yes/no saturated or unsaturated? G. Ionic Reactions in Solution 1. Write the word and formula equations representing the chemical reaction that occurred between the barium chloride solution, BaCl,(aq), and the sodium sulfate solution, Na SO (aq). Word Equation: Formula Equation: 2. (a) Which of the…

A 1.232-gram sample of copper complex weighed 0.783 g after heating. What is the percent of volatile material in this sample? If the sample contains 17.4% ammonia, what is the percent water in the sample?

What aspects of the structure of indigo contribute to a high melting point? Draw a resident structure of indigo to illustrate your explanation. Indigo H. NaOH H + 2 NO2 H. Indigo te: If you would like to dye something with your indigo, bring a small piece of cotton or ol fabric, such as a handkerchief or socks, to class. Yarn also works nicely, no nte nlease. The textile must fit loosely in the beaker that you're using as your

In addition to the separation techniques used in this lab (magnetism, evaporation, and filtering), there are other commonly used separation techniques. Some of these techniques are:Distillation – this process is used to separate components that have significantly different boiling points. The solution is heated and the lower boiling point substance is vaporized first. The vapor can be collected and condensed and the component recovered as a pure liquid. If the temperature of the mixture is then raised, the next higher boiling component will come off and be collected. Eventually only non-volatile components will be left in the original solution.Centrifugation – a centrifuge will separate mixtures based on their mass. The mixture is placed in a centrifuge tube which is then spun at a high speed. Heavier components will settle at the bottom of the tube while lighter components will be at the top. This is the technique used to separate red blood cells from blood plasma.Sieving – this is…

ed The boiling point of water is 100.00 °C at 1 atmosphere. A student dissolves 12.63 grams of sodium sulfide, Na₂S (78.05 g/mol), in 163.3 grams of water. Use the table of boiling and freezing point constants to answer the questions below. Solvent Water Ethanol Chloroform Benzene Formula H₂O CH3CH₂OH CHCI 3 соно Diethyl ether CH3CH₂CH₂CH3 The molality of the solution is The boiling point of the solution is Kb (°C/m) Kf (°C/m) 0.512 1.86 1.22 1.99 3.67 2.53 2.02 m. °C. 5.12

When 184. mg of a certain molecular compound X are dissolved in 85. g of formamide (NH,COH ), the freezing point of the solution is measured to be 1.7 °C. Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits. Ox10 미

Part C: Determination of the alcohol content of unknown liquor Stretien Volume (mL) Sample ТИШТИНА 0.00% alcohol 10.0% alcohol 20.0% alcohol 40.0% alcohol 50.0% alcohol Unknown Mass (g) 1o podina ko 9.8919 9.7899 9.600 9 9.420 д % Alcohol content of the liquor 9.2155 9.5089 2VLELA CVOLION: MEAEK EVI OK DRA IVBOKY LOBAN ocen 10.00 10.00 10.00 10.00 10.00 10.00 Density (g/mL) 0.00% alcohol calculation: ися → о 0.99 во 0.99 To Z si doleW 120.00 supinubst sdi na LANG 411 bet [squardas: 0.97 0.94 in oil to notisalarisi 0.92 0.95

A certain liquid X has a normal freezing point of -2.10 °C and a freezing point depression constant -1 K₁=3.79 °C kg-mol . A solution is prepared by dissolving some zinc chloride (ZnCl₂) in 450. g of X. This solution freezes at -5.3 °C. Calculate the mass of ZnCl₂ that was dissolved. Round your answer to 2 significant digits. g x10 X Ś

A certain liquid X has a normal boiling point of 105.30 °C and a boiling point elevation constant K₁ = 1.74 °C-kg-mol¯¹. Calculate the boiling point of a solution made of 8.59g of ammonium chloride (NHCl) dissolved in 150. g of X. Round you answer to 5 significant digits. пос x10 X

Substance Formula Acetone. lodine Biphenyl C₂H₂O 1₂ C₁₂H₁0 Structure (show all bonds, Aen, label P/NP) Predicted Polarity Solubility Experimentál Solubility Polarity

Dynamic equilibrium can be defined as O rate of dissolution rate of dissolving rate of condensing > rate of bubbling rate of dissolution = rate of recrystallization. rate of dissolution > rate of recrystallization.